SITE INFORMATION AND CORRESPONDENCE_2006-2007

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r 111M VIMUR R ENVIRONMENTAL MANAGEMENT&CONSULTING ENGINEERING September 28, 2007 001-06750-07-401 Mark A. Adams, P.G., Trustee Lincoln Center Environmental Remediation Trust Point Environmental 137 Park Place Richmond, California 94801 Subject: Request for Discontinuing Groundwater Extraction from Wells GWE-001 and GWE-002 and Abandonment of Groundwater Extraction Well GWE-002 and Piezometers PZ-002A-1, PZ-002A-2, and PZ-003A, Lincoln Center, Stockton, California Dear Mr. Adams: On behalf of the Lincoln Center Environmental Remediation Trust ("the Trust"), LFR Inc. (LFR) is requesting the Regional Water Quality Control Board's (RWQCB's) concurrence with the subject request. This letter was prepared at the request of Ms. Marie McCrink of the RWQCB during a site visit on August 7, 2007, which was attended by Ms. McCrink of the RWQCB and Don Bradshaw and Lucas Goldstein of LFR. As we discussed during this visit, the property owner has notified the Trust of plans to expand the World Savings building located at Lincoln Center near the corner of Pacific Avenue and Ben Holt Drive (see photograph presented as Attachment 1). According to the property owner, the footprint of the building would be expanded approximately 150 feet to the south. This proposed expansion would require the abandonment of wells located within the footprint of the proposed building, namely groundwater extraction well GEW-002 and piezometers PZ-002A-1, PZ-002A-2, and PZ-003A. As we discussed during the August 7, 2007 site visit, the Trust is not contemplating the replacement of the groundwater extraction well or piezometers slated for abandonment. Extraction well GWE-002 was installed in 1998 as part of the Phase I Interim Remedial Action(IRA). In LFR's opinion, extraction wells GWE-001 and GWE-002 are no longer needed as part of the implementation of the Phase I IRA. As documented in LFR's most recent groundwater monitoring report ("Groundwater Monitoring Report for the Semiannual Period from January 1 through June 30, 2007, Lincoln Center, Stockton, California," dated August 15, 2007), these wells are outside the current plume dimensions and are therefore no longer needed to capture affected groundwater. For confirmation purposes, groundwater samples were collected from extraction wells GWE-001 through GWE-003 on July 12, 2007. Halogenated volatile organic compounds were reportedly not detected in groundwater extraction wells GWE-001 and GWE-002 above the laboratory reporting limit (0.13 microgram per liter of tetrachloroethylene). Laboratory reports are presented in Attachment 2. The shutdown of these two wells will not negatively impact the operation of the 510.652.4500 m 510,652.2246 f 1900 Powell street, 12th Floor www.lfr.com Emeryville,California 94608-1814 Offices Nationwide